There and Back Again As Quick As a Flash

Transcription

1 There and Back Again As Quick As a Flash Stefan Winkler Independent Software Developer and IT Consultant CDO Committer on Twitter

2 CDO in a nutshell

3 CDO in a nutshell

4 CDO in a nutshell CDOID attribute reference

5 CDO in a nutshell CDOID CDOID attribute reference CDOID

6 CDO in a nutshell CDOID CDOID attribute reference

7 CDO in a nutshell CDOID CDOID attribute reference

8 CDO in a nutshell CDOID attribute reference

9 CDO in a nutshell CDOID CDOID attribute reference

10 CDO in a nutshell CDOID CDOID attribute reference

11 CDO in a nutshell CDOID attribute reference CDOID attribute reference

12 CDO in a nutshell CDOID attribute reference CDOID attribute reference

13 Layers App Logic EMF Model CDO CDO IStore Code

14 App Logic EMF Model CDO CDO IStore Code

15 Choose the Right! time to read 10,000 objects (msec) time to write 10,000 objects (msec) MEM DB (h2 in-proc) DB (h2 net) DB (MySQL) Hibernate (MySQL) MongoDB (net) DB4O (in-proc)

16 Choose the Right! Store Usage Scenarios Pros Cons MEMStore DBStore HibernateStore MongoDB Store DB4OStore ObjectivityStore prototyping, testing common/default solution custom DB schema required No SQL DB wanted, fast writing speeds required supports all CDO features supports all CDO features custom DB schema and mapping fast writing speeds not persistent DB selection and tuning adds to complexity only supports subset of CDO features, slower slow reading speeds, limited commit size No SQL DB wanted, fast reading speeds required fast reading speeds slower writing speeds dual licence OODB with commercial support needed performance not measured commercial licence, performance not measured

17 Choose the Right Database! time to read 10,000 objects time to write 10,000 objects (msec) h2 (net) MySQL (net) PostgreSQL (net)

18 Choose the Right Database! time to read 10,000 objects time to write 10,000 objects (msec) h2 (net) and tweak it! Standard Configurations!!! MySQL (net) PostgreSQL (net)

19 App Logic EMF Model CDO CDO IStore Code

20 Choose the Right Repository Mode Audit Mode v1 v2 v3 v4 v5 v6 v7 Time

21 Choose the Right Repository Mode Non-Audit Mode v1 v2 v3 v4 v5 v6 v7 Time

22 Choose the Right Repository Mode Branching Mode 0:v1 v2 v3 v4 v5 v6 1:v1 1:v2 2:v1 2:v2 2:v3 Time

23 Choose the Right DBStore Mapping! non-audit repo mode writes deltas Order date sum no historic ( audit ) views Product Product date Product date sum number sum price Order id version date sum 1 2 3/29/ Product id version number price Order_Product_List id version index value

24 Choose the Right DBStore Mapping! Order audit repo mode classic always writes complete list range-based writes deltas id version date sum 1 2 3/29/ Order_Product_List Product id version number price id version index value

25 Choose the Right DBStore Mapping! Order audit repo mode classic always writes complete list id version date sum 1 2 3/29/ Product id version number price range-based writes deltas Order_Product_List id from to index value 1 1 null null null 2 4

26 Choose the Right DBStore Mapping! branching repo mode classic vs. range-based copy-lazy (default) vs. copy-on-branch Order_Product_List id branch from to index value null null null 2 4

27 Choose the Right DBStore Mapping! branching repo mode classic vs. range-based copy-lazy (default) vs. copy-on-branch Order_Product_List id branch from to index value null null null 2 4 Order_Product_List id branch from to index value null 1 5

28 Choose the Right DBStore Mapping! branching repo mode classic vs. range-based copy-lazy (default) vs. copy-on-branch Order_Product_List id branch from to index value null null null 2 4 Order_Product_List id branch from to index value null 1 5

29 Choose the Right DBStore Mapping! branching repo mode classic vs. range-based copy-lazy (default) vs. copy-on-branch Order_Product_List id branch from to index value null null null 2 4

30 Choose the Right DBStore Mapping! branching repo mode classic vs. range-based copy-lazy (default) vs. copy-on-branch Order_Product_List id branch from to index value null null null 2 4 Order_Product_List id branch from to index value null null null 2 4

31 Choose the Right DBStore Mapping! time to insert 100 objects at beginning time to insert 100 objects in the middle time to insert 100 objects at the end non-audit audit branching branching w/ ranges

32 App Logic EMF Model CDO CDO IStore Code

33 Choose the Right Transport Layer! CDO CDO Computer 1 Computer 2 TCP (true client/server) CDO CDO TCP (same computer) CDO CDO JVM (same JVM)

34 A Word On Caching Revision Caches in CDO use Soft references Caches grow until memory limit is reached CDO CDO View Cache can be configured to use strong or weak references instead View Cache (Soft Ref) Session Cache (Soft Ref) Repository Cache (Soft Ref) view.options().setcachereferencetype(referencetype.strong);

35 App Logic EMF Model CDO CDO IStore Code

36 Choose the Right Model Configuration! time to read 100,000 objects time to write 100,000 objects (msec) Native Reflective Legacy

37 App Logic EMF Model CDO CDO IStore Code

38 Make Use of CDO Loading Policies! Lazy Collection Loading session.options().setcollectionloadingpolicy( CDOUtil.createCollectionLoadingPolicy( /* initial = */ 5, /* onresolve = */ 5)); Explicit Prefetching CDOObject fromcdo = getmyobjectfromcdo(); fromcdo.cdoprefetch(/* depth = */ 3); Prefetching by Policy view.options().setrevisionprefetchingpolicy( CDOUtil.createRevisionPrefetchingPolicy( /* size = */ 5));

39 Leftovers Things I did not talk about unordered collections store queries (use with caution!) LOBs & streaming

40 Summary Choose the Right! Choose the Right Database! Choose the Right Repository Mode! Choose the Right DBStore Mapping! Choose the Right Transport Layer! Choose the Right Model Configuration! Make Use of CDO Loading Policies!